Centerpiece Help!

Hello all, I have been trying to get a lot of stuff done for my wedding this summer, since I will be in school until the week before the big day! I made this as a centerpiece idea. I originally wanted ostrich feathers, but these will store much better and also my mother felt that feathers were a little over the top.

My problem is that I had to pay a lot for these fake flowers. I think that fact that they came on realistic stems really upped the price – however, I don’t need the stems, obviously! I am wondering if any of you have any ideas where I can find some nice fake flowers heads? I have been searching but I am not having a lot of luck! Thank you!

Also, as a sidenote, these won’t sit on that clear vase since that would be eye level. I have big eiffel tower vases that the finished ones will go on!